400 Year of manufacture
Printed From: The Ford Torino Page
Category: Powertrain Specific Forum
Forum Name: 335 Series Engine Forum
Forum Description: 351C, 351M and 400 engines
URL: https://forum.grantorinosport.org/forum_posts.asp?TID=4165
Printed Date: 26-March-2026 at 3:24PM
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com
Topic: 400 Year of manufacture
Posted By: conard
Subject: 400 Year of manufacture
Date Posted: 26-August-2010 at 5:31AM
| I am trying to detirmine the year of a 400 I am looking at The only number that I have at this time is off of the intake D1AE9425AC Can anyone help me ? Thanks Conard |
Replies:
Posted By: GranTorinoSport
Date Posted: 26-August-2010 at 7:46AM
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The "Bubba's M-Block workshop" I have re-hosted here at The Ford Torino Page after it's disappearance for many years will provide the answer. The date codes specifically are posted here (where to find them): http://grantorinosport.org/BubbaF250/parts/pics02.html - http://grantorinosport.org/BubbaF250/parts/pics02.html And then the webpage main part is here: (you'll want to hunt around as there is a great amount of 351M/400 stuff on there): http://grantorinosport.org/BubbaF250/index.html - http://grantorinosport.org/BubbaF250/index.html ------------- Scott Eklund Webmaster |
Posted By: SquireCJ
Date Posted: 26-August-2010 at 5:09PM
| The date code on the intake is not the best way to determine the year of the engine unless you know it is original to the engine and car. According to the date code of the the intake it is a 1971 intake. You can find the date code on the block stamped on the underside where the starter mounts. It can not be seen without the starter removed. Also, on the back side of the block there is a date code with a partial VIN of the original vehicle the engine came from but can not be read with the engine still in the car. |
Posted By: conard
Date Posted: 26-August-2010 at 7:12PM
| Thank you very much forthehelp One follow up question I am told that the 1971 400 engines had a higher horse power rating than 1972 up If this istrue is it worth the trouble of using a 1971 engine Thanks again Conard |
Posted By: conard
Date Posted: 26-August-2010 at 7:13PM
Sorry my space bar sticks 
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Posted By: SquireCJ
Date Posted: 26-August-2010 at 7:32PM
| If I remember correctly, the 1971 400 had pistons that came up closer to the top than later year 400 engines, although most of the difference (drop)in horse power from 1971 compared to 1972 and following model years is as a result of a change in the way the horse power was measured. Starting in the 1972 model year all manufactures used a standardized method of reporting net horse power at the crank, which is lower number than what was being used prior to that model year. The drop in horse power rating were across the board on all engines not just the 400 and not just Ford. As well, the manufactures were starting to de-tune engines at that time to meet the change to unleaded gasoline and various smog regulations. |
Posted By: torkair
Date Posted: 27-August-2010 at 8:52AM
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If it's a true '71 400 motor it will have flat top pistons, in 72 they switched to dished pistons.
------------- 72 Gran Torino "sport"- in progress 73 Ranchero GT- Q code-460/C6/3.25 open rear |
Posted By: conard
Date Posted: 27-August-2010 at 10:33AM
| Is it enough of an upgrade to pay 300.00 for and drive 250 miles to get ? I allready have a set of aussie heads between that and an eldelbrock intake and carb Would it be a a noticable difference from my stock 1975 400 ? Thanks Conard |